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Implement CTAssignable for DecafPoint.

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Isis Lovecruft 2017-05-14 02:59:54 +00:00
parent b6faf7c05e
commit 7478814dfc
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32
src/decaf.rs
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@ -283,6 +283,38 @@ impl DecafBasepointTable {
}
}
// ------------------------------------------------------------------------
// Constant-time conditional assignment
// ------------------------------------------------------------------------
impl CTAssignable for DecafPoint {
/// Conditionally assign `other` to `self`, if `choice == 1u8`.
///
/// # Example
///
/// ```
/// # use curve25519_dalek::curve::Identity;
/// # use curve25519_dalek::decaf::DecafPoint;
/// # use curve25519_dalek::subtle::CTAssignable;
/// # use curve25519_dalek::constants;
/// let A = DecafPoint::identity();
/// let B = constants::DECAF_ED25519_BASEPOINT;
///
/// let mut P = A;
///
/// P.conditional_assign(&B, 0u8);
/// assert!(P == A);
/// P.conditional_assign(&B, 1u8);
/// assert!(P == B);
/// ```
fn conditional_assign(&mut self, other: &DecafPoint, choice: u8) {
self.0.X.conditional_assign(&other.0.X, choice);
self.0.Y.conditional_assign(&other.0.Y, choice);
self.0.Z.conditional_assign(&other.0.Z, choice);
self.0.T.conditional_assign(&other.0.T, choice);
}
}
// ------------------------------------------------------------------------
// Debug traits
// ------------------------------------------------------------------------